选自沈括《梦溪笔谈·技艺》卷一八。选活板又叫活字印刷术,中国四大发明之一。用雕板印刷书籍的方法唐朝人还没有大规模采用。五代时才开始印刷五经,以后的各种图书都是雕板印刷本。宋仁宗庆历元年至八年间,即公元1041-1048年间,一位名叫毕昇的普通劳动者发明了活字版印刷术。沈括比毕昇小十几岁,是同时代的人,而且毕昇制造的陶活字后来归沈括的侄子所有,因此沈括《梦溪笔谈》中关于毕昇发明活字版印刷术的记载是翔实可信的。
撕裂断层与低角度正断层或逆冲断层相交时常形成有利圈闭,如活板构造等。
The tear fault intersected with low angle normal fault or thrust fault can form some traps, e. g. trap-door structure trap.
38他掀起柜台的活板,穿过一扇侧门,并沿着暖和而昏暗的楼梯和过道走去,还经过如今正回荡着噪音的一个个车间,一路脸上泛着柔和的微笑。
38A meek smile accompanied him as he lifted the counterflap, as he passed in through a sidedoor and along the warm dark stairs and passage, along the now reverberating boards.
活苔藓浴垫 这块浴垫是由一块防腐泡沫板构成,它是三株活苔藓(球形苔,依兰苔,林苔)的苗圃。
Living Moss Bath Mat Constructed of a decay-resistant foam called plastazote, this bath mat is a nursery for three varieties of living moss: ball mass, island moss and forest moss.
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